Un nuovo episodio del podcast Planet Money, di NPR.

The U.S. government spends a ton of money, on everything from Medicare to roads to defense. In fact, it spends way more than it takes in. So…it borrows money, in the bond market. By selling U.S. Treasurys, basically IOUs with periodic interest payments. And for decades, people have loved to invest in Treasurys, for their safety and security.